corrected spelling error

Author: themattwilliams

README.md

@@ -115,7 +115,7 @@ Just like the other functions here, `.filter()` also takes additional arguments,
 
 ### .reduce()
 
-Reduce is an incredibly powerful method that allows us to combine all of the result in an array into a single result. There are a few different ways we can use it, so it's important to read the documentation careful!
+Reduce is an incredibly powerful method that allows us to combine all of the result in an array into a single result. There are a few different ways we can use it, so it's important to read the documentation carefully!
 
 [Check out the docs.](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
 
@@ -186,4 +186,4 @@ users.reduce(function (usersObj, user) {
 //   'Zach Klabunde': 'Instructor' }
 ```
 
-Notice the empty object as the second argument in reduce, as well as the fact that we're constantly returning our `usersObj` on each iteration.
+Notice the empty object as the second argument in reduce, as well as the fact that we're constantly returning our `usersObj` on each iteration.